Pinty Red & Green Reflex Holographic Rifle Scope Dot Sight 4 Different Reticles Aircraft grade aluminum alloy construction, durable and easy to clean. Light-weight water-proof, fog-proof and shock-proof enhance performance in all weather conditions. Red and green reticle with four patterns offer unlimited eye-relief and corrected parallax Tubeless design with 33mm reflex lens, wide field of view. Windage and elevation adjustable (tools included in the package), built-in picatinny mount base for easy sight remounting. Object Aperture: 33mm Field of View: 15.8m@100m Output: 1mw Housing Size: 3.2 x 2.6 inches/82 x 66 mm Reticle Selector:4 Patterns and 4 Variable Dot Tube diameter: 33mm Switch and Stepless Intensity control Wavelength: 650nm Power: &lt; 5mw Integrated mount for standard 20mm rails